The announced cast also includes Jeffrey Wright ("The Hunger Games: Mockingjay" Parts 1 and 2) as Arlo's father, Poppa; Steve Zahn ("Captain Fantastic," "Ridiculous Six") as a pterodactyl named Thunderclap; AJ Buckley ("Murder in the First," "Justified") as a T-Rex named Nash; Anna Paquin ("True Blood") as a T-Rex named Ramsey; Sam Elliott ("Justified") as a T-Rex named Butch; Frances McDormand ("Olive Kitteridge," "Fargo") as Arlo's mother, Momma; and Marcus Shribner ("black-ish") as Arlo's brother Buck.

The poster for Pixar's "The Good Dinosaur."

The poster for Pixar's "The Good Dinosaur."

Noticeably missing from the cast is John Lithgow, who was initially set to play Poppa. A number of other roles also seem to have been re-cast.

"We were lucky to work with a number of incredible pros along the way, and our story ultimately led us to this amazing and talented group,” Sohn said in a release. "The Good Dinosaur" will be his first time directing a feature film.

The cast, of course, is not the only thing to change along the way for "The Good Dinosaur." Sohn took over as director after Pixar removed the initial director, Bob Peterson, from the project in 2013.